Key card access can be accomplished in different ways, whether swiping through a card reader, held up to a card reader or the push of a button on a key fob. Some access systems can also open with a smartphone app. Key card entry systems need three components to work, including:

Credentials for access – key fobs and key cards are small electronic devices that grant access credentials to specific people. They contain a built-in sensor or chip that communicates to the access reader.
Access reader – the access reader is the component that scans the card to verify access and gives instructions to unlock the door.
Magnetic or electric door lock – magnetic or electric door locks allow the door to unlock from the signal received by the access reader.

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